If you want a service that's got daily challenges and a big library of images to get your creative juices flowing, Artbreeder is a great choice. The site lets you create images with AI tools like Composer and Collager, and its community-oriented design means there are millions of images to browse and daily challenges to get you thinking creatively. Artbreeder employs cutting-edge technology like GANs to create new and interesting images, and it's got a range of subscription plans to suit different needs, so it's good for both casual and serious artists.
If you're interested in AI-generated art, OpenArt is a collection of relatively simple-to-use AI drawing tools and editing options. You can create custom art based on text prompts, with a variety of styles and models. It's good for artists of all skill levels, with different pricing tiers for different needs and budgets.